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CCS/TMS320F28027: TMS320F28027 function void AdcOffsetSelfCal() problem

Andrey Chernyshev
Prodigy 210 points

Part Number: TMS320F28027
Other Parts Discussed in Thread: CONTROLSUITE, C2000WARE

Tool/software: Code Composer Studio

Hello! I have the following problem, I initialize the ADC to turn on the built-in temperature sensor, but when I get into the AdcOffsetSelfCal () function, I have problems. When I get to the Uint16 AdcConversion (void) function, I reach the while loop (index <SampleSize), it runs once, then the loop starts again, but the program stops on the while condition (AdcRegs.ADCINTFLG.bit.ADCINT1 == 0 ) and no it can not go further.

void AdcOffsetSelfCal()
{
Uint16 AdcConvMean;
EALLOW;
AdcRegs.ADCCTL1.bit.ADCREFSEL = 0; //Select internal reference mode
AdcRegs.ADCCTL1.bit.VREFLOCONV = 1; //Select VREFLO internal connection on B5
AdcChanSelect(13); //Select channel B5 for all SOC
AdcRegs.ADCOFFTRIM.bit.OFFTRIM = 80; //Apply artificial offset (+80) to account for a negative offset that may reside in the ADC core
AdcConvMean = AdcConversion(); //Capture ADC conversion on VREFLO
AdcRegs.ADCOFFTRIM.bit.OFFTRIM = 80 - AdcConvMean; //Set offtrim register with new value (i.e remove artical offset (+80) and create a two's compliment of the offset error)
AdcRegs.ADCCTL1.bit.VREFLOCONV = 0; //Select external ADCIN5 input pin on B5
EDIS;
}

/* AdcChanSelect-
This function selects the ADC channel to convert by setting all SOC channel selects to a single channel.

* IMPORTANT * This function will overwrite previous SOC channel select settings. Recommend saving
the previous settings.
*/
void AdcChanSelect(Uint16 ch_no)
{
AdcRegs.ADCSOC0CTL.bit.CHSEL= ch_no;
AdcRegs.ADCSOC1CTL.bit.CHSEL= ch_no;
AdcRegs.ADCSOC2CTL.bit.CHSEL= ch_no;
AdcRegs.ADCSOC3CTL.bit.CHSEL= ch_no;
AdcRegs.ADCSOC4CTL.bit.CHSEL= ch_no;
AdcRegs.ADCSOC5CTL.bit.CHSEL= ch_no;
AdcRegs.ADCSOC6CTL.bit.CHSEL= ch_no;
AdcRegs.ADCSOC7CTL.bit.CHSEL= ch_no;
AdcRegs.ADCSOC8CTL.bit.CHSEL= ch_no;
AdcRegs.ADCSOC9CTL.bit.CHSEL= ch_no;
AdcRegs.ADCSOC10CTL.bit.CHSEL= ch_no;
AdcRegs.ADCSOC11CTL.bit.CHSEL= ch_no;
AdcRegs.ADCSOC12CTL.bit.CHSEL= ch_no;
AdcRegs.ADCSOC13CTL.bit.CHSEL= ch_no;
AdcRegs.ADCSOC14CTL.bit.CHSEL= ch_no;
AdcRegs.ADCSOC15CTL.bit.CHSEL= ch_no;
} //end AdcChanSelect

/* AdcConversion -
This function initiates several ADC conversions and returns the average. It uses ADCINT1 and ADCINT2
to "ping-pong" between SOC0-7 and SOC8-15 and is referred to as "ping-pong" sampling.

* IMPORTANT * This function will overwrite previous ADC settings. Recommend saving previous settings.
*/
Uint16 AdcConversion(void)
{
Uint16 index, SampleSize, Mean, ACQPS_Value;
Uint32 Sum;

index = 0; //initialize index to 0
SampleSize = 256; //set sample size to 256 (**NOTE: Sample size must be multiples of 2^x where is an integer >= 4)
Sum = 0; //set sum to 0
Mean = 999; //initialize mean to known value

//Set the ADC sample window to the desired value (Sample window = ACQPS + 1)
ACQPS_Value = 6;
AdcRegs.ADCSOC0CTL.bit.ACQPS = ACQPS_Value;
AdcRegs.ADCSOC1CTL.bit.ACQPS = ACQPS_Value;
AdcRegs.ADCSOC2CTL.bit.ACQPS = ACQPS_Value;
AdcRegs.ADCSOC3CTL.bit.ACQPS = ACQPS_Value;
AdcRegs.ADCSOC4CTL.bit.ACQPS = ACQPS_Value;
AdcRegs.ADCSOC5CTL.bit.ACQPS = ACQPS_Value;
AdcRegs.ADCSOC6CTL.bit.ACQPS = ACQPS_Value;
AdcRegs.ADCSOC7CTL.bit.ACQPS = ACQPS_Value;
AdcRegs.ADCSOC8CTL.bit.ACQPS = ACQPS_Value;
AdcRegs.ADCSOC9CTL.bit.ACQPS = ACQPS_Value;
AdcRegs.ADCSOC10CTL.bit.ACQPS = ACQPS_Value;
AdcRegs.ADCSOC11CTL.bit.ACQPS = ACQPS_Value;
AdcRegs.ADCSOC12CTL.bit.ACQPS = ACQPS_Value;
AdcRegs.ADCSOC13CTL.bit.ACQPS = ACQPS_Value;
AdcRegs.ADCSOC14CTL.bit.ACQPS = ACQPS_Value;
AdcRegs.ADCSOC15CTL.bit.ACQPS = ACQPS_Value;


//Enable ping-pong sampling

// Enabled ADCINT1 and ADCINT2
AdcRegs.INTSEL1N2.bit.INT1E = 1;
AdcRegs.INTSEL1N2.bit.INT2E = 1;

// Disable continuous sampling for ADCINT1 and ADCINT2
AdcRegs.INTSEL1N2.bit.INT1CONT = 0;
AdcRegs.INTSEL1N2.bit.INT2CONT = 0;

AdcRegs.ADCCTL1.bit.INTPULSEPOS = 1; //ADCINTs trigger at end of conversion

// Setup ADCINT1 and ADCINT2 trigger source
AdcRegs.INTSEL1N2.bit.INT1SEL = 6; //EOC6 triggers ADCINT1
AdcRegs.INTSEL1N2.bit.INT2SEL = 14; //EOC14 triggers ADCINT2

// Setup each SOC's ADCINT trigger source
AdcRegs.ADCINTSOCSEL1.bit.SOC0 = 2; //ADCINT2 starts SOC0-7
AdcRegs.ADCINTSOCSEL1.bit.SOC1 = 2;
AdcRegs.ADCINTSOCSEL1.bit.SOC2 = 2;
AdcRegs.ADCINTSOCSEL1.bit.SOC3 = 2;
AdcRegs.ADCINTSOCSEL1.bit.SOC4 = 2;
AdcRegs.ADCINTSOCSEL1.bit.SOC5 = 2;
AdcRegs.ADCINTSOCSEL1.bit.SOC6 = 2;
AdcRegs.ADCINTSOCSEL1.bit.SOC7 = 2;
AdcRegs.ADCINTSOCSEL2.bit.SOC8 = 1; //ADCINT1 starts SOC8-15
AdcRegs.ADCINTSOCSEL2.bit.SOC9 = 1;
AdcRegs.ADCINTSOCSEL2.bit.SOC10 = 1;
AdcRegs.ADCINTSOCSEL2.bit.SOC11 = 1;
AdcRegs.ADCINTSOCSEL2.bit.SOC12 = 1;
AdcRegs.ADCINTSOCSEL2.bit.SOC13 = 1;
AdcRegs.ADCINTSOCSEL2.bit.SOC14 = 1;
AdcRegs.ADCINTSOCSEL2.bit.SOC15 = 1;

DELAY_US(ADC_usDELAY); // Delay before converting ADC channels


//ADC Conversion

AdcRegs.ADCSOCFRC1.all = 0x00FF; // Force Start SOC0-7 to begin ping-pong sampling

while( index < SampleSize ){

//Wait for ADCINT1 to trigger, then add ADCRESULT0-7 registers to sum
while (AdcRegs.ADCINTFLG.bit.ADCINT1 == 0){}                       the program stops here
AdcRegs.ADCINTFLGCLR.bit.ADCINT1 = 1; //Must clear ADCINT1 flag since INT1CONT = 0
Sum += AdcResult.ADCRESULT0;
Sum += AdcResult.ADCRESULT1;
Sum += AdcResult.ADCRESULT2;
Sum += AdcResult.ADCRESULT3;
Sum += AdcResult.ADCRESULT4;
Sum += AdcResult.ADCRESULT5;
Sum += AdcResult.ADCRESULT6;
// Wait for SOC9 conversion to start, which gives time for SOC7 conversion result
while( AdcRegs.ADCSOCFLG1.bit.SOC9 == 1 ){}
Sum += AdcResult.ADCRESULT7;

//Wait for ADCINT2 to trigger, then add ADCRESULT8-15 registers to sum
while (AdcRegs.ADCINTFLG.bit.ADCINT2 == 0){}
AdcRegs.ADCINTFLGCLR.bit.ADCINT2 = 1; //Must clear ADCINT2 flag since INT2CONT = 0
Sum += AdcResult.ADCRESULT8;
Sum += AdcResult.ADCRESULT9;
Sum += AdcResult.ADCRESULT10;
Sum += AdcResult.ADCRESULT11;
Sum += AdcResult.ADCRESULT12;
Sum += AdcResult.ADCRESULT13;
Sum += AdcResult.ADCRESULT14;
// Wait for SOC1 conversion to start, which gives time for SOC15 conversion result
while( AdcRegs.ADCSOCFLG1.bit.SOC1 == 1 ){}
Sum += AdcResult.ADCRESULT15;

index+=16;

} // end data collection

//Disable ADCINT1 and ADCINT2 to STOP the ping-pong sampling
AdcRegs.INTSEL1N2.bit.INT1E = 0;
AdcRegs.INTSEL1N2.bit.INT2E = 0;

while(AdcRegs.ADCSOCFLG1.all != 0){} // Wait for any pending SOCs to complete

// Clear any pending interrupts
AdcRegs.ADCINTFLGCLR.bit.ADCINT1 = 1;
AdcRegs.ADCINTFLGCLR.bit.ADCINT2 = 1;
AdcRegs.ADCINTOVFCLR.bit.ADCINT1 = 1;
AdcRegs.ADCINTOVFCLR.bit.ADCINT2 = 1;

//reset RR pointer to 32, so that next SOC is SOC0
AdcRegs.SOCPRICTL.bit.SOCPRIORITY = 1;
while( AdcRegs.SOCPRICTL.bit.SOCPRIORITY != 1 );
AdcRegs.SOCPRICTL.bit.SOCPRIORITY = 0;
while( AdcRegs.SOCPRICTL.bit.SOCPRIORITY != 0 );

Mean = Sum / SampleSize; //Calculate average ADC sample value

return Mean; //return the average

}//end AdcConversion

  • 0
    TI__Guru 62975 points

    Andrey,

    Are you able to run the unmodified adc_soc and adc_temp_sensor examples from C2000Ware or controlSUITE?  

    -Tommy

  • 0 in reply to tlee
    Prodigy 210 points
    I tried it, but I had some kind of error when I wrote the firmware. I ran my code using the ADCINT4 ADC and temperature measurement (different firmware), everything works fine. But when you add a function void AdcOffsetSelfCal () inside it, the program does not exit the cycle specified above.
  • 0 in reply to Andrey Chernyshev
    TI__Guru 62975 points

    Andrey Chernyshev said:
    I tried it, but I had some kind of error when I wrote the firmware.

    Can you clarify this statement? It is not clear to me if the C2000Ware examples work correctly or not on your setup. This piece of information is important for me to determine if you are experiencing a software or hardware problem.

  • 0 in reply to tlee
    Prodigy 210 points
    When I compile the Example_2802xAdcTempSensor.c project, I get the following error:
    "Description Resource Path Location Type
    This project was created using a version of compiler that is not currently installed - 6.4.2 [C2000]. See “Help> Install New Software” and select “Code Generation Tools Updates” to check if this compiler is available through a CCS update. Visit <a href="liveaction:OpenAppCenter"> CCS App Center </a> to get the latest compiler support. Or <a href="software-dl.ti.com/.../downloads"> download </a> and install the compiler for CCS> Build> Compilers'. Example_2802xAdcTempSensor propertis
  • 0 in reply to Andrey Chernyshev
    TI__Guru 62975 points

    Andrey,

    It sounds like you are probably using a new-ish CCS installation with controlSUITE examples.

    If this is the case, you have two options:

    Option 1: Download and use the examples from C2000Ware, which is the successor to controlSUITE.  C2000Ware current receives periodic updates to work with the latest CCS tool versions.  controlSUITE does not receive updates any more.

    Option 2: Install a C2000 6.4.x Code Generation Tool (CGT compiler) from the CGT downloads page and update the example project properties to use the older compiler.

    -Tommy

  • 0 in reply to tlee
    TI__Guru 62975 points
    Andrey,

    It has been a while since your last update. I assume that you were able to resolve your issue. If this isn’t the case, please reject this resolution and reply to this thread. If this thread is locked, please make a new thread describing the current status of your issue.

    -Tommy